2008 Volume 51 Issue 2 Pages 107-113
The vapor-liquid equilibria (VLE) data of systems including tetrahydropyran (THP) are impotant, as tetrahydropyran is a useful reaction solvent and separation solvent, but are scarce in the literature. The boiling points of three binary systems at six pressures from 40.00 to 98.66 kPa were measured using a hold-up compensable ebulliometer. The binary system consisting of THP + toluene was nonazeotropic, whereas THP + n-heptane and THP + water were azeotropic. Furthermore, the THP + water system formed heterogeneous mixtures. Measured boiling points were satisfactorily correlated using the NRTL (Non Random Two-Liquid) equation. The mean deviations between the experimental and calculated boiling points were 0.08 K for THP + n-heptane, 0.09 K for THP + toluene and 1.75 K for THP + water systems. The ASOG (Analytical Solution of Groups) group pair parameters for the CH2, ArCH, H2O, and pyran groups were determined. Infinite-dilution partial molar excess entropies and enthalpies were determined for THP and solvents.
